Build: Fix deranking of blog posts in Typesense search index

Follows-up 5f810e5. It set the page_rank low correctly, but the
order matters. First match decides.

I based this on https://github.com/jquery/jqueryui.com/blob/b53c29bcfe80618608c94fa3aba19356c92fa5c2/docsearch.config.json, where the important one is listed first, but
I failed to realize that the order isn't sensitive there since the
content is on two separate domains. For us the order matters as one
is a subset of the other.

Author: Krinkle

docsearch.config.json

@@ -1,8 +1,8 @@
 {
   "index_name": "qunitjs_com",
   "start_urls": [
-    { "url": "https://qunitjs.com", "page_rank": 20 },
-    { "url": "https://qunitjs.com/blog/", "selectors_key": "blog", "page_rank": 1 }
+    { "url": "https://qunitjs.com/blog/", "selectors_key": "blog", "page_rank": 1 },
+    { "url": "https://qunitjs.com", "page_rank": 20 }
   ],
   "selectors": {
     "lvl0": "h1",